JPH1125882A - Deflection yoke - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form precise winding distribution of a coil and to reduce dispersion by forming a toroidal coil by providing a groove in a core and embedding a rectangular conductor in the groove. SOLUTION: In a deflection device for a color cathode-ray tube display with a vertical deflection coil and a horizontal deflection coil, which generate magnetic field for deflecting an electron beam vertically and horizontally, a groove is made in a core 2 of the deflection yoke with a toroidal coil. When a coil is made by winding a conductor 3 with a rectangular cross section without making any clearance, the groove has a size to accept the coil without making a clearance. The number of coils, a position of each coil, the number of windings, a winding width and a winding thickness are determined by magnetic field analysis or the like. Through this structure with the rectangular conductor 3 and the core 2 having the groove size, a color cathode ray tube equipped with a deflection yoke in which position displacement of a conductor when winding a coil is eliminated, and misconvergence quality is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke mounted on a cathode ray tube of a television receiver, a display device or the like.

[0002]

2. Description of the Related Art Generally, a deflection yoke which is mounted on a color picture tube having three electron guns in an in-line arrangement and deflects an electron beam generated by each electron gun is basically composed of a vertical deflection coil, a horizontal deflection coil, Consists of a core. A vertical deflection magnetic field and a horizontal deflection magnetic field are generated by a vertical deflection coil and a horizontal deflection coil, and the electron beam is deflected in a vertical direction and a horizontal direction. The core is a magnetic material. The magnetic field generated by the vertical deflection coil has a distribution called a barrel type (barrel type), and the magnetic field generated by the horizontal deflection coil has a distribution called a pincushion type (pin cushion type).

By using a deflection magnetic field having such a distribution, ideally, three electron beams reach the same position on the picture tube screen. When the beam reaches a position shifted on the tube surface, a state of color shift occurs. Such a displacement amount is called misconvergence, and the misconvergence is zero in an ideal cathode ray tube.

In the development of an actual deflection yoke, the shapes and winding distributions of the vertical deflection coil and the horizontal deflection coil are optimized so that the misconvergence is equal to or less than an allowable value. The magnetic field distribution is determined by the winding distribution of each coil. The effect on the magnetic field distribution is different between the winding near the magnetic pole of the coil and the winding far from the magnetic pole. Therefore, optimization can be achieved by adjusting the winding distribution.

The vertical deflection coil and the horizontal deflection coil of such a deflection yoke can be roughly classified into saddle type coils and toroidal type coils. FIG. 4 shows a toroidal coil. A coil is formed by winding a conductor around a core 2 having a uniform cross section.
Is made. The number of windings, winding width, winding thickness, and winding distribution of this coil are adjusted for optimization. With the recent development of computers, design studies using magnetic field analysis and the like are possible.

However, even if a detailed design study is performed using a computer, it is difficult to actually produce a deflection yoke without misconvergence. One of the causes is a winding error of the conductor at the time of coil winding. No matter how thoroughly the design is studied, if the position of the conductor varies during the actual winding of the deflection yoke coil, an optimum magnetic field distribution cannot be obtained, resulting in misconvergence.

[0007]

Even if the coil shape of the deflection yoke is optimized at the design stage so that misconvergence does not occur, variations in the conductors at the time of coil winding may cause a problem.
In other words, the position of the conductor is deviated from the position determined at the time of design, causing misconvergence and deteriorating the quality of the deflection yoke. If the displacement of the conductor occurs between the design stage and the coil winding, it is difficult to develop a deflection yoke without misconvergence. A precise winding distribution of the deflection yoke coil is formed to reduce variations.

[0008]

In order to solve the above problems, a groove is provided in a core so that the position of a coil does not shift,
The structure of a deflection yoke of a toroidal coil having a structure in which a rectangular conductor is embedded in this groove to form a coil.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS.

FIG. 1 shows a toroidal coil having a structure in which a rectangular conductor 3 is wound around a core 2 and a coil 1 (1a, 1b, 1c, 1d, 1e) is provided. The number of coils, the position of each coil, the number of windings, the winding width, and the winding thickness can be determined by magnetic field analysis or the like. Here, each coil 1a, 1b, 1c, 1d, 1
2 and 3 show a structure in which e is wound around the core 2. FIG. FIG. 2 is a partial detailed view of the core 2 where the coil is wound. A groove is formed in the core 2, and a conductor is wound in the groove. FIG. 3 is a sectional view showing a state where the conductor 3 is wound around the groove. The conductor 3 is a conductor having a rectangular cross section. When the coil is formed by winding the rectangular conductor 3 without gaps,
The size of the groove of the core 2 is made so that this coil can be inserted without any gap. Due to the structure of the rectangular conductor 3 and the core 2 having the dimensions of the groove, there is no displacement of the conductor position during coil winding.

[0011]

According to the present invention, it is possible to provide a color cathode ray tube having a deflection yoke which can eliminate misalignment of conductors during coil winding and improve misconvergence quality.

[Brief description of the drawings]

FIG. 1 is a perspective view of a toroidal coil having the structure of the present invention.

FIG. 2 is a diagram showing a structure of a core.

FIG. 3 is a sectional view in which a coil is wound around a core.

FIG. 4 is a perspective view of a conventional toroidal coil.

[Explanation of symbols]

 1 ... coil, 2 ... core, 3 ... square conductor.

Claims (1)

[Claims] A deflecting device for a color cathode ray tube display having a vertical deflection coil and a horizontal deflection coil for generating a magnetic field for deflecting an electron beam in a vertical and horizontal direction. A deflection yoke having a toroidal coil having a structure in which a rectangular conductor is wound around to form a winding.